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<div><span>Dear all,</span><br>
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<div> Hi! I encounter an interesting assertion failure: (sorry for re-sending the email because I need to add the details of the assertion)<br>
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<div> /usr/local/include/llvm/PassAnalysisSupport.h:262: AnalysisType& llvm::Pass::getAnalysisID(llvm::AnalysisID, llvm::Function&) [with AnalysisType = llvm::ScalarEvolutionWrapperPass; llvm::AnalysisID = const void*]: Assertion `ResultPass && "Unable
to find requested analysis info"' failed<br>
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<div><br>
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<div> when implementing my Pass, which is defined with the member functions shown below:<br>
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<div>======================My Pass======================================<br>
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<div>bool MYPass::runOnModule(Module &M)<br>
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<div>{<br>
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<div> for (auto &F : M)<br>
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<div> {<br>
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<div> SE = &getAnalysis<ScalarEvolutionWrapperPass>(F).getSE();<br>
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<div> ......<br>
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<div> }<br>
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<div> }<br>
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<div> return false;<br>
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<div>}<br>
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<div><br>
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<div>void MYPass::getAnalysisUsage(AnalysisUsage &AU) const<br>
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<div>{<br>
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<div> AU.setPreservesAll();<br>
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<div> AU.addRequired<LoopInfoWrapperPass>();<br>
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<div> AU.addRequired<ScalarEvolutionWrapperPass>();<br>
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<div> AU.addRequired<LoopAccessLegacyAnalysis>();<br>
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<div> AU.addRequired<DominatorTreeWrapperPass>();<br>
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<div> AU.addRequired<OptimizationRemarkEmitterWrapperPass>(); <br>
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<div>}</div>
<div>===================================================================<br>
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<div><br>
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<div> Then, I got the assert failure when running the pass on the following code<br>
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<div>======================Target Code with Assertion Failure==============================<br>
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<div>void f ( int A[50][100]) {<br>
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<div> int N = 100;<br>
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<div> int M = 50;<br>
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<div> int B[50][100];<br>
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<div> for ( int j = 0; j < N; j++ )<br>
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<div> for ( int i = 0; i < M; i++ )<br>
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<div> B[i][j]=i;<br>
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<div> for ( int j = 1; j < N; j++ )<br>
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<div> for ( int i = 1; i < M; i++ )<br>
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<div> A[i][j] = i%2? A[i-1][j]:B[i][j];<br>
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<div> return;<br>
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<div>}<br>
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<div>======================================================================<br>
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<div> The thing made this failture interesting is that I got no failure when running the pass on the other code, e.g.<br>
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<div>===========================Target Code without Assertion Failure=====================================<br>
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<div>void f ( int A[50][100],int B[50][100]) {<br>
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<div> int N = 100;<br>
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<div> int M = 50;<br>
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<div> for ( int j = 0; j < N; j++ )<br>
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<div> for ( int i = 0; i < M; i++ )<br>
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<div> B[i][j]=i;<br>
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<div> for ( int j = 1; j < N; j++ )<br>
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<div> for ( int i = 1; i < M; i++ )<br>
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<div> A[i][j] = i%2? A[i-1][j]:B[i][j];<br>
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<div> return;<br>
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<div>}<br>
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<div><br>
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<div> I am confused by this situation because this failure has not occurred before and it shoud not be effected by the target code.</div>
<div> Thanks in advance for your time and suggestion!!!^_^<br>
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<div>Best regards,<br>
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<div>------------------------------------------<br>
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<div>Tingyuan LIANG<br>
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<div>MPhil Student<br>
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<div>Department of Electronic and Computer Engineering<br>
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<div>The Hong Kong University of Science and Technology<br>
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